There's NO reason to muck around with unregulated voltage drop resistors from the age of dinosaurs.
There's all sorts of solid-state regulators available from companies that cater to classic car enthusiasts.
Or, get a cheap generic DC power supply that plugs into a cigarette lighter and has a switch to set desired voltage from Wallaby World (or equivalent) and hard-wire it and tuck it out of sight under the dash somewhere. I have done exactly that a number of times. (A "6-Volt" system operated at about 7.4 Volts with the engine running.)
You can also build your own using an IC regulator for a couple of bucks. I've done that, as well, and still have a '53 GMC truck I set up that way.
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Today's Featured Article - The Niagra View Mobile - Powered by a 1959 Ford Tractor - by Mark Massey. In 1959 the Niagara Frontier Transit Inc. of Buffalo, New York designed and built six Viewmobiles for the Niagara Frontier Sightseeing Inc. for use as a sightseeing ride at the Niagara Falls State Park, Niagara Falls, New York, powered by a 1959 Ford 611 Tractor.
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